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This video shows how to view Free Slack (or float), Total Slack (or float), and Zero Slack (or float) in ProjectLibre.
1. Free Slack (or float) = the amount of time a task (or activity) can be delayed without delaying a successor task.
2. Total Slack (or float) = the amount of time a task can be delayed without delaying the project.
3. Zero Slack (or float), also known as the Critical Path = if any of the tasks (or activities) are delayed the project will be delayed. The critical path is the sequence of tasks with the longest path through a project.